List the structural features of the human erythrocyte.

Erythrocytes are important constituents of human blood. Their structure has its own characteristics:
1. The shape of the cell is a biconcave disc.
2. The formed nucleus is absent in these cells, as well as the intracellular membrane septa.
3. Very small in diameter and thickness.
4. They have a simple, very thin membrane with a unique configuration.



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